Steam-turbine.



0. BANNER.

STEAM TURBINE.

APPucATxoN min APR. 1o. 1914.

LILS. Patented Nov. 23, 1915.

COLUMBIA PLANQGRAPK c0..wAsHlNaTON, D. c.

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a rrp OTTO BANNER, OF EASTON, PENNSYLVANIA, i .LSSIGrNOR` TO INGERSOLL-RAN'D COM- PANY, OF JERSEY CITY, JERSEY, A CORQPOBATION OF JERSEY.

STEAM-TURBINE.

Speciiication of Letters Patent.

Patented Nov. 23, 1915.

Application led April 10, `1914. Serial No. 830,845.

To all whom it may concern Be it known that I, OTTO BANNER, a subject of the German Emperor, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Steam- Turbines, of which the following is a speciication.

r1`his invention relates to steam turbines and more particularly to the construction of turbines adapted for use with high pressure steam with or without supplemental low pressure Steam.

The object of this invention is to provide a turbine of this type which will be of simple and economical construction, compact in size and adapted to operate with a high comparatively constant eiiiciency through a large range of loads.

These objects are accomplished by the turbine, a practical embodiment of which is shown in the accompanying drawings, in which,

Figure 1 shows a longitudinal section through a portion of the turbine taken on the line 1-1 of Fig. 2, and Fig. 2 shows a horizontal section through the high pressure wheel taken on the line 2-2 of Fig. 1.

The turbine, as shown, comprises a casing 1 which has, at its outer end, a high pressure steam chamber 2. lnwardly of this chamber 2 the casing is reduced in diameter forming a series of low pressure chambers 3, 4, 5 and 6, and others, not shown, which are separated from the high pressure chamber 2 and from each other by diaphragms 7, 8, 9 and 10, the chambers 5 and 6 being shown of greater diameter than 8 and 4, although this is not essential.

1n the high pressure chamber rotates a single bladed high pressure wheel 11 which receives steam through a nozzle 12 communicating with a high pressure steam chest 13 which is placed on the inner face of the larger diameter of the casing and thus does not increase the necessary dimensions of the casing in any direction. A balanced valve 14, of ordinary construction, controls the admission of steam from the steam chest 13 to the nozzle 9, steam being admitted to the steam chest through a pipe 15.

rlFhe valve 14 is operated from the governor of the turbine, not shown, by any suitable regulating mechanism 16, the details of which form no part of the present invention, and may be as shown in my previous Patent No. 1,117,306 granted November 17th, 1914.

The steam from the nozzle 9 passes through the blades of the wheel 8 toward the outer end of the turbine and is received by a reversing passage 17 of ordinary construction, which is provided as usual with guiding vanes 18. This reversing passage 17 directs the steam again through the high pressure wheel to the inner side of the wheel, from thence it can pass directly and without any impedance through the nozzles 19 in the first low pressure wheel 20 and thence through the nozzles 21, 22 and 23 and their respective low pressure wheels to the exhaust of the turbine.

By means of this construction, a very compact and economical turbine can be manufactured and one of high comparatively constant eiiiciency through a large range of loads by reason of the fact that steam passes more than once through the high pressure blades thus fractionally abstracting the velocity of the high pressure steam which then passes without hindrance to be further expanded in the low pressure nozzles.

Although the tin-bine is here shown with a single nozzle and reversing passage, it is obvious that more than one nozzle and re versing passage therefor may be used without departing from my invention and furthermore, the steam may be passed more than twice through the high pressure wheel by the reversing passages without invention and it is to be understood that the present showing and description discloses only one specified modification of my invention and other forms and modiiications are included in the spirit and scope of the invention as expressed in the claim.

What 1 claim is:

In a steam turbine, a casing having a high pressure chamber at one end, and low pressure chambers of smaller diameter communieating therewith, a single bladed high pressure wheel in said high pressure chamber, a steam chamber on the inner side of said high pressure chamber, having a nozzle for directing steam through said high pressure wheel toward the end of the turbine, a reversing passage for redirecting the steam in the opposite direction through In testimony whereof, I have hereunto set said high pressure Wheel, a series of 10W my hand.

pressure Wheels in said 10W pressure cham- J 1 bers and nozzles `for directing steam from OTTO BNNLI" 5 the high pressure chamber through said 10W Witnesses:

pressure Wheels in the same direction as said PAUL HOFFMAN,

reversing passage. F. A. Porn.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

